High solids cross-linked ethylene propylene diene terpolymer latex

摘要

A high solids cross-linked ethylene propylene diene terpolymer latex consisting of 15 weight percent to 88 weight percent ethylene propylene diene terpolymer with a molecular weight from 1300000 Mw to 5000 Mw, 10 weight percent to 70 weight percent of a water, 1 weight percent to 15 weight percent of a surfactant, and 0.3 weight percent to 1.76 weight percent of a curative.

主权项

1. A cross-linked ethylene propylene diene terpolymer latex with a solids content from 30 weight percent to 60 weight percent based on the total weight of the cross-linked ethylene propylene diene terpolymer latex, the cross-linked ethylene propylene diene terpolymer latex comprising:
a. 15 weight percent to 88 weight percent of a premixed liquid ethylene propylene diene terpolymer component in 50 weight percent to 96 weight percent of a solvent, wherein the premixed liquid ethylene propylene diene terpolymer component has a molecular weight from 1300000 Mw to 5000 Mw, and consists of:
(i) 4 weight percent to 50 weight percent of random covalently linked monomers of ethylene and propylene having weight ratios from 40:60 to 85:15 of ethylene:propylene respectively; and(ii) 0.25 weight percent to 15 weight percent of the polymer component is a non-conjugated diene; b. 10 weight percent to 70 weight percent of a water, wherein the water is selected from the group consisting of: distilled water, deionized water, tap water, process water, and combinations thereof; c. 1 weight percent to 30 weight percent of a surfactant; and d. at least a portion of at least one of: a sulfur donative curative and a free radical generating curative, wherein the portion is within a weight percent from 0.3 weight percent to 1.76 weight percent of a total amount of curative used in the formulation, thereby forming a cross-linked ethylene propylene diene terpolymer miscible with acrylic, urethane, alkyd, and epoxy lattices; and
wherein upon heating the cross-linked ethylene propylene diene terpolymer, the cross-linked ethylene propylene diene terpolymer further cross-links and if the formulation has a cross-link density less than 50 percent when at least 99 percent of the water is removed from the cross-linked ethylene propylene diene terpolymer latex as determined by ASTM test D 3616 effective 2014, adding an additional portion of curative and heating a second time forming a dehydrated cross-linked ethylene propylene diene terpolymer latex which when applied to a substrate, the cross-linked ethylene propylene diene terpolymer latex exhibits: a glass transition temperature of −50 degrees Celsius to −40 degrees Celsius; an impact resistance as measured by a falling dart test that has less than a 50 percent failure at 20 inch-pound at an ambient temperature; a moisture barrier of less than 1.0 perm unit as determined by ASTM D 1735 effective 2014 preventing penetration of water to a substrate; and a color change of delta E of less than 5 as measured by the accelerated weathering tests ASTM G 154 and ASTM D 3632 both with effective dates of 2014.